On Sat, Nov 22, 2008 at 2:11 AM, Conrad Parker <[EMAIL PROTECTED]> wrote: > 2008/11/21 David Flynn <[EMAIL PROTECTED]>: >> On 2008-11-21, Conrad Parker <[EMAIL PROTECTED]> wrote: >>> 2008/11/15 David Flynn <[EMAIL PROTECTED]>: >>>> On 2008-11-14, Conrad Parker <[EMAIL PROTECTED]> wrote: > a granule is a frame, field, sample etc., and granulerate is framerate, > samplerate etc. > >> [1] Mostly with regard to a hypothetical 'timeline' -- but these are >> questions for some later time. > > Yeah; I've been thinking we should at least add a field to skeleton to > accomodate the Dirac mapping. The main thing is to identify which algorithm > to use for converting granulepos to time. Currently two are defined (linear > like Vorbis PCM, or Theora's granuleshift). The granuleshift method works > for many stream types with reverse dependencies, but cannot take into > account streams that are not encoded in presentation order. > > The way the current Dirac mapping works doesn't really fit into either of > those granulepos schemes, though it does do an awesomely clever job of > allowing pt to be calculated with the Theora granuleshift method :-)
Fisbone packets are built in a way that new fields can be inserted before the message header fields without breaking backwards compatibility. I would support such an extension! >> [2] http://wiki.xiph.org/index.php/Ogg_Skeleton says: >> """ >> allowing to map a granule position to time by calculating >> "granulepos / granulerate" >> """ >> But that doesn't seem to be what happened in liboggz -- it used GPH+L. > > thanks for pointing that out, the wiki page is incorrect. I don't understand enough about how it is wrong. Can you correct the wiki page? Thanks, Silvia. ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Schrodinger-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/schrodinger-devel
